<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        function Person(){

        }
        Person.prototype.eat = function(){
            console.log("吃东西")
        }

        var per = new Person();
        console.dir(per)
        console.dir(Person)
        //原型链的最终指向是Object的prototype的_proto_是null

    </script>
</body>
</html>